SIS SS-ISO 9178-2-1990 Templates for lettering and symbols Part 2 Slot widths for wood-cased pencils clutch pencils and fine-lead pencils《书写和符号模板 第2部分：木杆铅笔和细铅笔的槽宽》.pdf

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ITU-R RAPPORT M 766-2 FRENCH-1990 Feasibility of frequency sharing between the GPS and other services《全球定位系统和其他服务之间的频率共享的可行性》.pdf

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